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Installation and Operating Instructions
E
CHAPTER 4
SERVICING AND
MAINTENANCE
l m p r n
DANGER
WARNING
n
WARNING
l m p r n
EC axial high-performance fans HQ.. EC / HRF.. EC / HW.. EC
4.0
Servicing and maintenance
The safety instructions specified in Chapter 1, section 1.2 must be observed!
– The units are basically maintenance-free, there is no provision for user-maintenance. Nevertheless, all necessary
maintenance work must be carried out by authorised specialist personnel cf. section 2.0!
– Excessive deposits of dirt, dust, grease, etc. on the impeller, motor, protection guard and, above all, between the
housing and the impeller, are not permitted, as these can lead to an unbalance in the impeller, overheating of the
motor or the blocking of the impeller. In such cases, the unit must be cleaned, see section 4.1 Cleaning.
– Insofar as the unit has an important supply function, regular usage-based maintenance is required. In cases of longer
periods of standstill, maintenance must be carried out when the unit is restarted.
It must be ensured that the EC fan has been (all poles) disconnected from the mains power supply and
secured against reconnection before any work!
– The following must be checked:
• Secure mounting of the EC fan to the subsurface / system ¨ replace in case of doubt
• Contaminant deposits ¨ remove, see Cleaning 4.1
• Mechanical damage ¨ decommission unit, replace damaged parts
• Tightness of screw connections, particularly impeller mounting. Do not loosen screws in the process!
• Housing surface coating (e.g. rust, paint defects) -> repair
• Freewheeling of the impeller ¨ Is the impeller not running freely- see Fault causes 4.2
• Bearing noises ¨ replace motor
• Vibrations ¨ see Fault causes 4.2
• Power consumption according to type plate ¨ see Fault causes 4.2
4.1
Cleaning
The safety instructions specified in Chapter 1, section 1.2 must be observed!
It must be ensured that the EC fan has been (all poles) disconnected from the mains power supply and
secured against reconnection before starting cleaning!
– The disassembly of the unit or parts of the unit may be necessary for the cleaning.
This must be carried out by suitable specialist personnel cf. section 2.0!
– Clean flow area as well as impeller and motor.
– Do not use aggressive, paint-damaging cleaning agents!
– High pressure cleaners or jet water is not permitted!
4.2
Information – Fault causes
The safety instructions specified in Chapter 1, section 1.2 must be observed!
The elimination of faults must only be carried out by specialist personnel cf. section 2.0!
Controller-related faults are dealt with in section 2.5!
Error/fault
Fan does not start
Fuse blows
Residual current device
tripped
Incorrect flow direction Incorrect installation
Vibrations
Causes
No voltage
Impeller blocked
Motor blocked
Short-circuited coil/ground fault in
motor
Supply line/connection damaged
Connected incorrectly
Motor insulation damaged
Supply line insulation damaged
Incorrect release current
Incorrect connection
Contamination
Bearing damage
Incorrect operating point
Mounting-related resonance
12
Troubleshooting
Check mains voltage
Clear blockade, clean, replace impeller if
necessary
Check motor, replace if necessary
Replace motor
Replace parts, replace motor if necessary
Check connection, change
Replace motor
Replace supply lines
Check residual current device
Correct installation situation
Check/change connection
Clean
Replace motor
Check suitability of EC fan, Check/keep
inflow and outflow clear
Check/repair mounting, use vibration
damper
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